ATC 70 CC size while staying with regular gas

[spacerust]

Okay so I have three ATC 70’s. One is good to go and running great. Second one is running good but I need to change the clutch. Third motor is toast. My question is I pulled the motors for both 2 and 3. What is a decent engine upgrade since I have them out. without swapping a new motor and not having to use any race gas or anything? I would like to keep at least one looking original as well. Is there any difference going with the 88 big bore kit? I’ve read a lot of builds, but I guess input from others always helps


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[schlepp29]

My friend has an 88cc kit in his 70 and it does help.

[spacerust]

I have been looking into the 88cc and the 108 stroker. From what I've read, they say the stroker will be a better option than the 125cc Lifan. Anyone have experience with each to comment?

[yaegerb]

Okay so I have three ATC 70’s. One is good to go and running great. Second one is running good but I need to change the clutch. Third motor is toast. My question is I pulled the motors for both 2 and 3. What is a decent engine upgrade since I have them out. without swapping a new motor and not having to use any race gas or anything? I would like to keep at least one looking original as well. Is there any difference going with the 88 big bore kit? I’ve read a lot of builds, but I guess input from others always helps


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Keep your static comp ratio to 11:1 and below and you are safe on 93. Anything over that I would move to 108.

[3 Wheel Drive]

A 125 is much cheaper and easier to install.